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W.- H. HANKIN, Jr. Buck-Saw Frame.

No. 225,928 Patented Mar. 30,1880.

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N- PETERB, PHOTD-LITHDGRAPHER. WASHINGTON, DJ;

UNITED STATES PATENT OFFICE.

WILLIAM H. HANKIN, JR, OF oTIsvILLE, NEW YORK.

BUCK-SAW FRAME.

SPECIFICATION forming part of Letters Patent No. 225,928, dated March30, 1880.

Application filed February 1'7, 1880.

To all whom it may concern:

Be it known that I, WILLIAM H. HANKIN, J r., of Otisville, in the countyof Orange and State of New York, have invented certain new and usefulImprovements in Saw-Frames; and I do hereby declare that the followingis a full, clear, and exact description thereof, sufficient to enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, and in which Figure 1 is a sideview of my improved sawframe, partly in section; and Fig. 2 is a similarview, showing the upper bar or spring and the lower bar as out from theboard previous to their disposition in the frame.

This invention relates to improvements in saw-frames, the purpose ofwhich is to effect the ready and expeditious straining into position ofthe blade, the regulating of the pressure or tightening up of the parts,and the slackening up of the parts when it is desired to remove tensionfrom the blade or for other purpose and the nature of my inventionconsists in the employment, in a saw-frame, of two recurved bars withtwo points of contact between them, one near .each of their ends, andunited or bolted together at one of said points of contact, while asliding ring or cuff is fitted to move thereon past their other point ofcontact, the upper bar being made sufficiently light to serve as aspring, substantially as hereinafter more fully set forth.

In the accompanying drawings, A A mark the front and rear end pieces ofthe frame, with their upper ends connected together. It may be simply bypassing cord a around them, as shown, without a tightening turn-buckleor nutted and screw -threaded rods, with ends looped over said endpieces, or without twisting the rope with an interposed stay resting atits free end against a middle bar, after the manner of a torsion-spring,as heretofore practiced.

B is the blade, with its ends connected, as is usual, by metallic pinsor other suitable means, to and let into the lower end of the rear endpiece, A, and into the front end piece, A, in the same horizontal planewith the said end of the rear end piece. Below this point the front endpiece forms the handle-extension for one hand to grasp, while the otherhand catches or grasps the front end piece farther up in using the saw.

0 0 refer to two reourved bars, both of which are cut or partly formedat one operation from the same piece of board, as will be readilyunderstood by reference to Fig. 2, one being cut of a less thicknessthan the other, as shown in the two figures, to serve as a spring whenin use. These bars are disposed, the thicker one, 0, so as to constitutea lower rigid bar of the frame, with its ends resting in mortises in theend pieces, A A, and its two or less convex surfaces 0 0 presentedupwardly, while the thin or light one, C, is disposed in a reversedposition in the frame above the rigid bar 0, with its coincidentconvexities o 0 presented to those of the bar G, thus producing twopoints of contact between the two bars or the spring and the brace, atone of which they are bolted or riveted or otherwise firmly unitedtogether, as at d, to secure the spring or pressure when acted on, aspresently pointed out, at only one of their endsthe opposite end. Theforward or one end of the spring 0' fits into a mortise in the endpiece, A, while its other fits into a slot, 0, in the rear end piece, A,to permit it to have movement as it is acted upon or pressure removedtherefrom.

D is a sliding ring or cuff fitted to be adjusted back and forth uponthe rear ends of the brace and spring 0 0, between theiroppositely-diverging surfaces, as fully illustrated in Fig. 1, thepurpose of which, it is obvious, is to tighten or loosen the spring, asmay be desired.

By sliding the ring or cuff D toward and causing it to compress thedivergent end of the spring 0 and press or hold the same down in thebottom of its slot in the end piece, A, or by moving it in a reversedirection, so as to act upon the reourved or convex surface of thespring 0, as indicated in dotted lines in Fig. 1, the blade will bestrained, and the straining pressure can be regulated as the ring ismoved over a greater or less surface of the spring. This also tightensup the parts of the frame, while by moving the ring in the concavitiesformed by the curved upper and lower surfaces of the spring and brace OO the pressure will, to a degree, be taken off the spring, and the partsthus be loosened and the strain taken off the saw, as is desirable whennot in use, the contrary being entirely unnecessary and holding theblade under tension.

This invention also permits the ready removal of the blade for itsrenewal or other purpose.

I claim and desire to secure by Letters Patcut- The combination, in asaw-frame, of the recurved bar and spring 0 O, with one of their pointsof contact firmly united together, and provided with a ring or cuff, D,which is adapt- Witnesses: V

W. H. S'ronDARD, H. BULL.

